diff --git a/Resources/Locale/en-US/maps/planet.ftl b/Resources/Locale/en-US/maps/planet.ftl
index 6c8f4aff00..6d93782cfb 100644
--- a/Resources/Locale/en-US/maps/planet.ftl
+++ b/Resources/Locale/en-US/maps/planet.ftl
@@ -2,4 +2,5 @@ cmd-planet-desc = Converts the supplied map into a planet with some specific bio
 cmd-planet-help = {$command} <mapid> <biome>.
 cmd-planet-args = Requires 2 args only.
 cmd-planet-map = Unable to parse {$map} as an existing map.
+cmd-planet-map-prototype = Unable to index {$prototype} as an existing biome template prototype.
 cmd-planet-success = Set map {$mapId} to Planet. NOTE! You will need to load the map (either onto a new map or by restarting the game) for atmospherics to work.